Interactive teaching of elementary digital logic design with WinLogiLab

This paper presents an interactive computerized teaching suite developed for the design of combinatorial and sequential logic circuits. This suite fills a perceived gap in the currently available computer-based teaching software, with the purpose of providing alternative-mode subject delivery. The authors were, therefore, prompted to develop a Microsoft-Windows tutorial suite, WinLogiLab, comprising a set of interactive tutorials that show the link between Boolean algebra and digital combinatorial and sequential circuits. The combinatorial tutorials follow the initial design steps: from Boolean algebra, to truth tables, to minimization techniques, to production of the combinatorial circuit in a seamless way. Similarly, the sequential tutorials can design simple finite-state counters and can model more complex finite-state automata.     

Rapid prototyping system for teaching real-time digital signalprocessing

A low-cost rapid-prototyping system using Texas Instruments' (TI) TMS320C30 Evaluation Module (EVM) based on the MathWorks development software is presented in this paper. The rapid prototyping system serves as an educational tool in learning digital signal processing (DSP) and seeing the concept realized in real time. The development software modules, Simulink, uses graphical block diagrams to create models for real-time implementation and the real-time workshop (RTW), generates C code to be downloaded onto the EVM. The entire building process is fully automatic. This includes compiling, assembling and downloading of the real-time algorithms. The system was found to be well suited for learning real-time DSP algorithms for both undergraduate and postgraduate levels     

HVDC cable design logic for digital computers

A computer program to achieve complete cable designs is under development, and the principal logic elements and equations being used are presented. The design of high-voltage, direct-current transmission cables insulated with oil-impregnated cellulose paper is constrained by the maximum temperature and the maximum steady-state and transient stresses that the cable insulation can reliably withstand over the desired operating lifetime. Because the electrical stresses in the insulation are related in a very complex fashion to temperature, applied voltage, and cable geometry, iterative techniques are required to compute the values of these stresses. The equations and logical framework presented provide the basis for an effective computer program for iterative computation techniques     

3D打印数字人像快速成型技术的研究与实现

自动获取人像数据并高精度重建是三维人脸识别的研究热点。针对三维重构缺少成熟算法与有效应用方法的问题,提出了一种基于二维数据的三维打印数字人像快速成型方法。该方法采用二维照相的方法获取人像的正视图、侧视图和俯视图,使用MAYA软件对人像数据进行网格化处理,生成OBJ文件导入PROE生成三维实体,并导入JDpaint实现数控仿真加工,最后将STL文档导入打印机打印出三维人像。实验证明,该方法实现了数据获取、网格划分、曲面重建和快速成型的整个工作流程。     

A real-time control platform for rapid prototyping of induction motor vector control

This paper presents a real-time control platform developed for rapid prototyping of an induction motor (IM) vector control. Firstly, the control system is designed with the Simulink in the form of user-friendly block-diagrams. Next, c-codes are automatically generated from the block-diagrams with the real-time workshop. And lastly, an executable code, produced from the c-codes through a DSP c-compiler, is downloaded into a target DSP board. With this automatic programming scheme rapid prototyping is realized with the least low-level handwork programming. Presented control platform has been evaluated through the rapid prototyping of a voltage source inverter-fed IM driver and some experiments have been carried out to show its effectiveness.     

Noise margin criteria for digital logic circuits

Techniques for evaluating the noise margin for families of digital logic circuits are discussed and evaluated. It is shown that the technique of evaluating the -1 slope points on the inverter transfer function as used in most modern textbooks is not a valid and reliable approach to evaluating noise margin values. It is argued that the most reliable and reasonable criterion is to maximize the product of the two noise margins. This is equivalent to maximizing the area of a rectangle embedded within the loop formed by the transfer curves of an inverter pair. Most of the material presented can be found in the early literature on noise margin. However, because of the widespread use of the -1 slope criterion in modern textbooks, it is believed that a reexamination of basic approaches to noise margins is in order     

A programmable logic array suitable for use in digital systemdesign laboratories

A specially designed programmable logic array (PLA) suitable for use in digital system design laboratories for undergraduates is presented. Rewriting the PLA is done just by transferring the new codes; no explicit erasing process is required. The number of product terms allowed implementation on the PLA is unlimited. The computation speed of the PLA is less than 100 ns. The PLA can communicate with a host computer by accepting a variety of commands for writing PLA codes and monitoring input and output values for the PLA. Using software tools developed for the PLA, the student can perform laboratory experiments at various levels. Another software tool permits programming the PLA in a high-level language. The excitation (next-state) and output functions of a controller circuit are naturally described in a simple syntactic construct. Laboratory experiments utilizing the PLA and student responses are also given     

Top-down design process for gate-level combinational logic design

A pedagogical process for designing gate-level combinational logic circuits is described. The process can be used for either combinational logic circuits or the combinational logic sections of sequential logic circuits. Positive logic signals (active high signals) as well as negative logic signals (active low signals) can be used in the design process. The top-down design process allows the student to draw functional logic diagrams in a rather routine manner using the positive logic convention, or the direct polarity convention. After obtaining functional logic diagrams, realizable logic diagrams can be easily obtained using any of the common off-the-shelf gate types including AND, OR, NAND, and NOR elements with appropriate inverter symbols. The advantage of the top-down design process is that students can very easily understand and implement gate-level combinational logic functions. Examples are provided to illustrate the top-down design process in teaching combinational logic design     

Teaching computer design using virtual prototyping

The rapid increase in complexity and size of digital systems has reduced the effectiveness of old design methodologies based on physical prototyping. Prototyping via simulation must be used to achieve design cost and time-to-market goals when designing large digital systems. This virtual prototyping design methodology often permits the first physical prototype to be a manufacturable product. A two-course sequence has been developed to introduce students to this design paradigm. These courses teach virtual prototyping techniques and allow the students to use these techniques to develop a simple computer. The students simulate their designs, and then they implement their designs in hardware using field programmable hardware. This allows the students to complete an entire design cycle from idea to actual hardware implementation and compare their physical results to their simulated results.     

A computer-aided design tool for developing digital controllers andrelays

The design, development, and implementation of a computer-aided design (CAD) tool for developing digital controllers and relays are presented. The development includes modeling A/D converters, software, and the necessary logic. Procedures for modeling A/D converters and simulating the software are described. Application of the CAD tool is demonstrated by evaluating and comparing three different designs of a digital overcurrent relay. The designs are evaluated to determine both the speed and accuracy of the relays. The effects of the size of the A/D converters, the word-size used in computations, and the truncation/rounding are included in the simulation. Also described is the algorithm used in the relay design     

Rapid vessel prototyping: vascular modeling using 3t magnetic resonance angiography and rapid prototyping technology

Object Conversion of thoracic aortic vasculature as measured by Magnetic Resonance Imaging into a real physical replica. Materials and methods Several procedural steps including data acquisition with contrast enhanced MR Angiography at 3T, data visualization and 3D computer model generation, as well as rapid prototyping were used to construct an in-vitro model of the vessel geometry. Results A rapid vessel prototyping process was implemented and used to convert complex vascular geometry of the entire thoracic aorta and major branching arteries into a real physical replica with large anatomical coverage and high spatial resolution. Conclusion Rapid vessel prototyping permits the creation of a concrete solid replica of a patient’s vascular anatomy Parts of this work were presented at the ESMRMB 2005     

数字式保护装置的抗干扰设计

针对电磁干扰由传导、辐射、耦合3种方式作用于系统的情况,对传导干扰实行电容滤波和磁珠抑制高频干扰相结合的处理方法;对辐射干扰采用将干扰源和被干扰源进行金属壳接地屏蔽的方法：对耦合干扰采用印刷电路板PCB（Printed Circuit Board）设计时将易耦合干扰的线路两边用地线包围等措施;最终使保护装置的抗干扰性能得到很好改善。     

实景数字游戏无人机控制系统的设计与实现

主要将研制开发的实景数字游戏无人机控制系统的设计和实现做了全面的介绍,完整地分析了无人机的控制方法。首先通过1个无线通信模块Wiport建立了1个符合IEEE802.11b协议的无线局域网通信平台作为无人机控制信号通信系统。在此平台上,采用CPLD硬件,并编程完成对无人机飞行状态的控制,同时反馈无人机飞行的实时状态给服务器。本设计中的方案和控制方法也可应用于其他可在无线局域网中无线控制的游戏设备,比如无线控制机器人、无线控制航模等。     

A web-based educational environment for teaching the computer cache memory

In this paper, a Web-based educational setting for teaching the computer cache memory is presented, aiming at supporting and enhancing the learning process and promoting the active and constructive involvement of students. The educational setting includes Web text-based educational material, a Web-based cache memory simulation program, and educational activities that enable the students to participate actively in the learning process and to collaborate in groups. The design of the educational setting was based on the principles derived from the conceptual change approach regarding the students' theory framework, the students learning difficulties/misconceptions, the text comprehension theory, and contemporary teaching approaches. The results obtained from the application/evaluation of a set of educational activities have been encouraging, indicating that the simulation program and the context of the activities can effectively support and enhance the learning process.     

固体火箭发动机舰载环境无线监测系统设计

为了获取固体火箭发动机舰载环境载荷历程,设计了一套固体火箭发动机舰载环境无线监测系统.该系统通过1个局域存储控制器和多个温湿度监测节点之间的协调工作,实现了对多个联装导弹发射贮运箱内温度和相对湿度的同步监测.测试结果表明,该系统能对多个试验箱内的温度和相对湿度进行有效地监测,并具有低功耗、小体积、可靠的特点.     

A VLSI design system for teaching introduction to microelectronics

A set of software tools currently used for teaching a course on introduction to VLSI design to graduate and undergraduate students at Osaka University (Japan), the University of Toulouse (France), and the Polytechnical University of Barcelona (Spain), is described. The system includes tools such as schematic capture, mask-level design, and mix-mode simulation. Specific tools such as logic and analog simulation, three-dimensional process simulation, and CMOS logic cell compiler are also included in the software, which represents a valuable educational environment successfully used by a large number of students. The authors present an overview of the complete tool set, essential matters about MOS devices, and the CMOS process. They detail the techniques used for logic design, mask-level design, and mix-mode simulation. They discuss the interest of using such tools in such a course     

数字实景游戏中的智能红外激光枪系统设计与实现

将对实景数字游戏智能红外激光枪系统的设计和实现做全面的介绍,完整地分析智能红外激光枪系统的控制方法.系统通过建立1个符合IEEE802.11b/g协议的无线局域网平台,来实现对激光枪对战的后台控制,用凌阳SPCE061A单片机和无线局域网模块实现通信数据的编解码、语音处理和网络互联.红外激光枪采用980m的红外半导体激...     

数字相敏检波器的设计与实现

相敏检波器在RLC数字电桥测量过程中是很重要的一环,相敏检波器效率的高低、性能的好坏,直接影响到整个食品测量精度。鉴相效果的好坏与鉴相方法有直接的联系。本文利用数字全波鉴相,提高了鉴相效率,改善了鉴相效果,提高了RLC数字电桥的测量精度。     

Teaching design methodology and “industrial strength”EDA tools in a first-term freshman digital logic course

Perhaps contrary to popular opinion, this paper shows that it is actually quite easy and potentially very beneficial to introduce first-term freshman Electrical and Computer Engineering students to digital design methodology and state-of-the-art digital electronic design automation (EDA) tools. One major observed benefit is that this early exposure creates a high level of enthusiasm which helps students maintain their motivation while working through calculus, physics, circuits, general education, and other foundation classes. Another benefit is that later classes are greatly improved because students can build on the solid skill base developed in this first class. Also of importance, this early work with multiple-solution design problems and EDA tools often helps students decide if engineering is the right career choice for them